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Accurate Balanced Current Source

Publishing Venue

IBM

Related People

Carsalade, H: AUTHOR

Abstract

The purpose of this circuit is to provide a balanced and adjustable current or voltage threshold for multipurpose applications such as comparators with balanced or unbalanced hysteresis and accurate wave generators.

Country

United States

Language

English (United States)

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Accurate Balanced Current Source

The purpose of this circuit is to provide a balanced and
adjustable current or voltage threshold for multipurpose applications
such as comparators with balanced or unbalanced hysteresis and
accurate wave generators.

The circuit comprises a differential input stage 1, which controls the operation
of two matched current sources T9 and T10 in output stage 2, such that a current
I+ or I- flows in the load depending upon the values of input signals IN+ or IN-.

Collector currents of matched transistors T5 and T6 depend on the collector
current of transistor T11. Since emitter resistors r of transistors T5 and T6 are
equal, currents I(T5) and I(T6) are set equal to I. The collector current of
transistor T5 is reflected through matched transistors T7 and T8 in the collector
path of transistor T10.

When IN+ is higher than IN-, transistor T1 is OFF and transistor T2 is ON so
that transistor T10 is made conductive and current I- flows in the load.

Conversely, when IN- is higher than IN+, transistor Tl is ON
and transistor T2 is OFF so that transistor T9 is made conductive and
current I+ flows in the load.
Current I+ = I (1 + IBT9/I)
and Current I- = I (1 - IBT10/I)
where IBT9 and IBT10 are the base current of transistors T9 and T10,
respectively.

Consequently: I+ = (1 + Epsilon)I-
Epsilon = (IBT9 + IBT10) 1/I

Since I >>> IBT9, IBT10, Epsilon can be neglected and:
I = I- with a discrepancy of 0.1%.